<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        h1~p{
            color:red;
            font-size:30px;
        }
    </style>
</head>
<body>
    <h1>这是标题</h1>
    <p>内容1</p>
    <p>内容2</p>
    <p>内容3</p>
</body>
</html>